arch/s390/kvm/interrupt.c

   1 /*
   2  * handling kvm guest interrupts
   3  *
   4  * Copyright IBM Corp. 2008, 2015
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  *    Author(s): Carsten Otte <cotte@de.ibm.com>
  11  */
  12
  13 #include <linux/interrupt.h>
  14 #include <linux/kvm_host.h>
  15 #include <linux/hrtimer.h>
  16 #include <linux/mmu_context.h>
  17 #include <linux/signal.h>
  18 #include <linux/slab.h>
  19 #include <linux/bitmap.h>
  20 #include <linux/vmalloc.h>
  21 #include <asm/asm-offsets.h>
  22 #include <asm/dis.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/sclp.h>
  25 #include <asm/isc.h>
  26 #include "kvm-s390.h"
  27 #include "gaccess.h"
  28 #include "trace-s390.h"
  29
  30 #define IOINT_SCHID_MASK 0x0000ffff
  31 #define IOINT_SSID_MASK 0x00030000
  32 #define IOINT_CSSID_MASK 0x03fc0000
  33 #define IOINT_AI_MASK 0x04000000
  34 #define PFAULT_INIT 0x0600
  35 #define PFAULT_DONE 0x0680
  36 #define VIRTIO_PARAM 0x0d00
  37
  38 int psw_extint_disabled(struct kvm_vcpu *vcpu)
  39 {
  40         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
  41 }
  42
  43 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
  44 {
  45         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
  46 }
  47
  48 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
  49 {
  50         return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
  51 }
  52
  53 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
  54 {
  55         if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
  56             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
  57             (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
  58                 return 0;
  59         return 1;
  60 }
  61
  62 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
  63 {
  64         if (psw_extint_disabled(vcpu) ||
  65             !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
  66                 return 0;
  67         if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
  68                 /* No timer interrupts when single stepping */
  69                 return 0;
  70         return 1;
  71 }
  72
  73 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
  74 {
  75         if (!(vcpu->arch.sie_block->ckc <
  76               get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
  77                 return 0;
  78         return ckc_interrupts_enabled(vcpu);
  79 }
  80
  81 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
  82 {
  83         return !psw_extint_disabled(vcpu) &&
  84                (vcpu->arch.sie_block->gcr[0] & 0x400ul);
  85 }
  86
  87 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
  88 {
  89         return (vcpu->arch.sie_block->cputm >> 63) &&
  90                cpu_timer_interrupts_enabled(vcpu);
  91 }
  92
  93 static inline int is_ioirq(unsigned long irq_type)
  94 {
  95         return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
  96                 (irq_type <= IRQ_PEND_IO_ISC_7));
  97 }
  98
  99 static uint64_t isc_to_isc_bits(int isc)
 100 {
 101         return (0x80 >> isc) << 24;
 102 }
 103
 104 static inline u8 int_word_to_isc(u32 int_word)
 105 {
 106         return (int_word & 0x38000000) >> 27;
 107 }
 108
 109 static inline unsigned long pending_floating_irqs(struct kvm_vcpu *vcpu)
 110 {
 111         return vcpu->kvm->arch.float_int.pending_irqs;
 112 }
 113
 114 static inline unsigned long pending_local_irqs(struct kvm_vcpu *vcpu)
 115 {
 116         return vcpu->arch.local_int.pending_irqs;
 117 }
 118
 119 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 120                                    unsigned long active_mask)
 121 {
 122         int i;
 123
 124         for (i = 0; i <= MAX_ISC; i++)
 125                 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 126                         active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
 127
 128         return active_mask;
 129 }
 130
 131 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 132 {
 133         unsigned long active_mask;
 134
 135         active_mask = pending_local_irqs(vcpu);
 136         active_mask |= pending_floating_irqs(vcpu);
 137         if (!active_mask)
 138                 return 0;
 139
 140         if (psw_extint_disabled(vcpu))
 141                 active_mask &= ~IRQ_PEND_EXT_MASK;
 142         if (psw_ioint_disabled(vcpu))
 143                 active_mask &= ~IRQ_PEND_IO_MASK;
 144         else
 145                 active_mask = disable_iscs(vcpu, active_mask);
 146         if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 147                 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 148         if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
 149                 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 150         if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 151                 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 152         if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
 153                 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 154         if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
 155                 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 156         if (psw_mchk_disabled(vcpu))
 157                 active_mask &= ~IRQ_PEND_MCHK_MASK;
 158         if (!(vcpu->arch.sie_block->gcr[14] &
 159               vcpu->kvm->arch.float_int.mchk.cr14))
 160                 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 161
 162         /*
 163          * STOP irqs will never be actively delivered. They are triggered via
 164          * intercept requests and cleared when the stop intercept is performed.
 165          */
 166         __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 167
 168         return active_mask;
 169 }
 170
 171 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 172 {
 173         atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 174         set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 175 }
 176
 177 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 178 {
 179         atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 180         clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 181 }
 182
 183 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 184 {
 185         atomic_clear_mask(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 186                           &vcpu->arch.sie_block->cpuflags);
 187         vcpu->arch.sie_block->lctl = 0x0000;
 188         vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 189
 190         if (guestdbg_enabled(vcpu)) {
 191                 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 192                                                LCTL_CR10 | LCTL_CR11);
 193                 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 194         }
 195 }
 196
 197 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 198 {
 199         atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
 200 }
 201
 202 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 203 {
 204         if (!(pending_floating_irqs(vcpu) & IRQ_PEND_IO_MASK))
 205                 return;
 206         else if (psw_ioint_disabled(vcpu))
 207                 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
 208         else
 209                 vcpu->arch.sie_block->lctl |= LCTL_CR6;
 210 }
 211
 212 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 213 {
 214         if (!(pending_local_irqs(vcpu) & IRQ_PEND_EXT_MASK))
 215                 return;
 216         if (psw_extint_disabled(vcpu))
 217                 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 218         else
 219                 vcpu->arch.sie_block->lctl |= LCTL_CR0;
 220 }
 221
 222 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 223 {
 224         if (!(pending_local_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
 225                 return;
 226         if (psw_mchk_disabled(vcpu))
 227                 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 228         else
 229                 vcpu->arch.sie_block->lctl |= LCTL_CR14;
 230 }
 231
 232 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 233 {
 234         if (kvm_s390_is_stop_irq_pending(vcpu))
 235                 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 236 }
 237
 238 /* Set interception request for non-deliverable interrupts */
 239 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 240 {
 241         set_intercept_indicators_io(vcpu);
 242         set_intercept_indicators_ext(vcpu);
 243         set_intercept_indicators_mchk(vcpu);
 244         set_intercept_indicators_stop(vcpu);
 245 }
 246
 247 static u16 get_ilc(struct kvm_vcpu *vcpu)
 248 {
 249         switch (vcpu->arch.sie_block->icptcode) {
 250         case ICPT_INST:
 251         case ICPT_INSTPROGI:
 252         case ICPT_OPEREXC:
 253         case ICPT_PARTEXEC:
 254         case ICPT_IOINST:
 255                 /* last instruction only stored for these icptcodes */
 256                 return insn_length(vcpu->arch.sie_block->ipa >> 8);
 257         case ICPT_PROGI:
 258                 return vcpu->arch.sie_block->pgmilc;
 259         default:
 260                 return 0;
 261         }
 262 }
 263
 264 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 265 {
 266         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 267         int rc;
 268
 269         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 270                                          0, 0);
 271
 272         rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 273                            (u16 *)__LC_EXT_INT_CODE);
 274         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 275         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 276                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 277         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 278                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 279         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 280         return rc ? -EFAULT : 0;
 281 }
 282
 283 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 284 {
 285         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 286         int rc;
 287
 288         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 289                                          0, 0);
 290
 291         rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 292                            (u16 __user *)__LC_EXT_INT_CODE);
 293         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 294         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 295                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 296         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 297                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 298         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 299         return rc ? -EFAULT : 0;
 300 }
 301
 302 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 303 {
 304         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 305         struct kvm_s390_ext_info ext;
 306         int rc;
 307
 308         spin_lock(&li->lock);
 309         ext = li->irq.ext;
 310         clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 311         li->irq.ext.ext_params2 = 0;
 312         spin_unlock(&li->lock);
 313
 314         VCPU_EVENT(vcpu, 4, "interrupt: pfault init parm:%x,parm64:%llx",
 315                    0, ext.ext_params2);
 316         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 317                                          KVM_S390_INT_PFAULT_INIT,
 318                                          0, ext.ext_params2);
 319
 320         rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 321         rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 322         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 323                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 324         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 325                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 326         rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 327         return rc ? -EFAULT : 0;
 328 }
 329
 330 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 331 {
 332         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 333         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 334         struct kvm_s390_mchk_info mchk = {};
 335         unsigned long adtl_status_addr;
 336         int deliver = 0;
 337         int rc = 0;
 338
 339         spin_lock(&fi->lock);
 340         spin_lock(&li->lock);
 341         if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 342             test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 343                 /*
 344                  * If there was an exigent machine check pending, then any
 345                  * repressible machine checks that might have been pending
 346                  * are indicated along with it, so always clear bits for
 347                  * repressible and exigent interrupts
 348                  */
 349                 mchk = li->irq.mchk;
 350                 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 351                 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 352                 memset(&li->irq.mchk, 0, sizeof(mchk));
 353                 deliver = 1;
 354         }
 355         /*
 356          * We indicate floating repressible conditions along with
 357          * other pending conditions. Channel Report Pending and Channel
 358          * Subsystem damage are the only two and and are indicated by
 359          * bits in mcic and masked in cr14.
 360          */
 361         if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 362                 mchk.mcic |= fi->mchk.mcic;
 363                 mchk.cr14 |= fi->mchk.cr14;
 364                 memset(&fi->mchk, 0, sizeof(mchk));
 365                 deliver = 1;
 366         }
 367         spin_unlock(&li->lock);
 368         spin_unlock(&fi->lock);
 369
 370         if (deliver) {
 371                 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
 372                            mchk.mcic);
 373                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 374                                                  KVM_S390_MCHK,
 375                                                  mchk.cr14, mchk.mcic);
 376
 377                 rc  = kvm_s390_vcpu_store_status(vcpu,
 378                                                  KVM_S390_STORE_STATUS_PREFIXED);
 379                 rc |= read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR,
 380                                     &adtl_status_addr,
 381                                     sizeof(unsigned long));
 382                 rc |= kvm_s390_vcpu_store_adtl_status(vcpu,
 383                                                       adtl_status_addr);
 384                 rc |= put_guest_lc(vcpu, mchk.mcic,
 385                                    (u64 __user *) __LC_MCCK_CODE);
 386                 rc |= put_guest_lc(vcpu, mchk.failing_storage_address,
 387                                    (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 388                 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA,
 389                                      &mchk.fixed_logout,
 390                                      sizeof(mchk.fixed_logout));
 391                 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 392                                      &vcpu->arch.sie_block->gpsw,
 393                                      sizeof(psw_t));
 394                 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 395                                     &vcpu->arch.sie_block->gpsw,
 396                                     sizeof(psw_t));
 397         }
 398         return rc ? -EFAULT : 0;
 399 }
 400
 401 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 402 {
 403         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 404         int rc;
 405
 406         VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
 407         vcpu->stat.deliver_restart_signal++;
 408         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 409
 410         rc  = write_guest_lc(vcpu,
 411                              offsetof(struct _lowcore, restart_old_psw),
 412                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 413         rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
 414                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 415         clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 416         return rc ? -EFAULT : 0;
 417 }
 418
 419 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 420 {
 421         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 422         struct kvm_s390_prefix_info prefix;
 423
 424         spin_lock(&li->lock);
 425         prefix = li->irq.prefix;
 426         li->irq.prefix.address = 0;
 427         clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 428         spin_unlock(&li->lock);
 429
 430         VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x", prefix.address);
 431         vcpu->stat.deliver_prefix_signal++;
 432         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 433                                          KVM_S390_SIGP_SET_PREFIX,
 434                                          prefix.address, 0);
 435
 436         kvm_s390_set_prefix(vcpu, prefix.address);
 437         return 0;
 438 }
 439
 440 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 441 {
 442         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 443         int rc;
 444         int cpu_addr;
 445
 446         spin_lock(&li->lock);
 447         cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 448         clear_bit(cpu_addr, li->sigp_emerg_pending);
 449         if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
 450                 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
 451         spin_unlock(&li->lock);
 452
 453         VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
 454         vcpu->stat.deliver_emergency_signal++;
 455         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
 456                                          cpu_addr, 0);
 457
 458         rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
 459                            (u16 *)__LC_EXT_INT_CODE);
 460         rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
 461         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 462                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 463         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 464                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 465         return rc ? -EFAULT : 0;
 466 }
 467
 468 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 469 {
 470         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 471         struct kvm_s390_extcall_info extcall;
 472         int rc;
 473
 474         spin_lock(&li->lock);
 475         extcall = li->irq.extcall;
 476         li->irq.extcall.code = 0;
 477         clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 478         spin_unlock(&li->lock);
 479
 480         VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
 481         vcpu->stat.deliver_external_call++;
 482         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 483                                          KVM_S390_INT_EXTERNAL_CALL,
 484                                          extcall.code, 0);
 485
 486         rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
 487                            (u16 *)__LC_EXT_INT_CODE);
 488         rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
 489         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 490                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 491         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 492                             sizeof(psw_t));
 493         return rc ? -EFAULT : 0;
 494 }
 495
 496 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 497 {
 498         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 499         struct kvm_s390_pgm_info pgm_info;
 500         int rc = 0, nullifying = false;
 501         u16 ilc = get_ilc(vcpu);
 502
 503         spin_lock(&li->lock);
 504         pgm_info = li->irq.pgm;
 505         clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
 506         memset(&li->irq.pgm, 0, sizeof(pgm_info));
 507         spin_unlock(&li->lock);
 508
 509         VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
 510                    pgm_info.code, ilc);
 511         vcpu->stat.deliver_program_int++;
 512         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 513                                          pgm_info.code, 0);
 514
 515         switch (pgm_info.code & ~PGM_PER) {
 516         case PGM_AFX_TRANSLATION:
 517         case PGM_ASX_TRANSLATION:
 518         case PGM_EX_TRANSLATION:
 519         case PGM_LFX_TRANSLATION:
 520         case PGM_LSTE_SEQUENCE:
 521         case PGM_LSX_TRANSLATION:
 522         case PGM_LX_TRANSLATION:
 523         case PGM_PRIMARY_AUTHORITY:
 524         case PGM_SECONDARY_AUTHORITY:
 525                 nullifying = true;
 526                 /* fall through */
 527         case PGM_SPACE_SWITCH:
 528                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 529                                   (u64 *)__LC_TRANS_EXC_CODE);
 530                 break;
 531         case PGM_ALEN_TRANSLATION:
 532         case PGM_ALE_SEQUENCE:
 533         case PGM_ASTE_INSTANCE:
 534         case PGM_ASTE_SEQUENCE:
 535         case PGM_ASTE_VALIDITY:
 536         case PGM_EXTENDED_AUTHORITY:
 537                 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
 538                                   (u8 *)__LC_EXC_ACCESS_ID);
 539                 nullifying = true;
 540                 break;
 541         case PGM_ASCE_TYPE:
 542         case PGM_PAGE_TRANSLATION:
 543         case PGM_REGION_FIRST_TRANS:
 544         case PGM_REGION_SECOND_TRANS:
 545         case PGM_REGION_THIRD_TRANS:
 546         case PGM_SEGMENT_TRANSLATION:
 547                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 548                                   (u64 *)__LC_TRANS_EXC_CODE);
 549                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 550                                    (u8 *)__LC_EXC_ACCESS_ID);
 551                 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
 552                                    (u8 *)__LC_OP_ACCESS_ID);
 553                 nullifying = true;
 554                 break;
 555         case PGM_MONITOR:
 556                 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
 557                                   (u16 *)__LC_MON_CLASS_NR);
 558                 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
 559                                    (u64 *)__LC_MON_CODE);
 560                 break;
 561         case PGM_VECTOR_PROCESSING:
 562         case PGM_DATA:
 563                 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
 564                                   (u32 *)__LC_DATA_EXC_CODE);
 565                 break;
 566         case PGM_PROTECTION:
 567                 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 568                                   (u64 *)__LC_TRANS_EXC_CODE);
 569                 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 570                                    (u8 *)__LC_EXC_ACCESS_ID);
 571                 break;
 572         case PGM_STACK_FULL:
 573         case PGM_STACK_EMPTY:
 574         case PGM_STACK_SPECIFICATION:
 575         case PGM_STACK_TYPE:
 576         case PGM_STACK_OPERATION:
 577         case PGM_TRACE_TABEL:
 578         case PGM_CRYPTO_OPERATION:
 579                 nullifying = true;
 580                 break;
 581         }
 582
 583         if (pgm_info.code & PGM_PER) {
 584                 rc |= put_guest_lc(vcpu, pgm_info.per_code,
 585                                    (u8 *) __LC_PER_CODE);
 586                 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
 587                                    (u8 *)__LC_PER_ATMID);
 588                 rc |= put_guest_lc(vcpu, pgm_info.per_address,
 589                                    (u64 *) __LC_PER_ADDRESS);
 590                 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
 591                                    (u8 *) __LC_PER_ACCESS_ID);
 592         }
 593
 594         if (nullifying && vcpu->arch.sie_block->icptcode == ICPT_INST)
 595                 kvm_s390_rewind_psw(vcpu, ilc);
 596
 597         rc |= put_guest_lc(vcpu, ilc, (u16 *) __LC_PGM_ILC);
 598         rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
 599                                  (u64 *) __LC_LAST_BREAK);
 600         rc |= put_guest_lc(vcpu, pgm_info.code,
 601                            (u16 *)__LC_PGM_INT_CODE);
 602         rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 603                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 604         rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 605                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 606         return rc ? -EFAULT : 0;
 607 }
 608
 609 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
 610 {
 611         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 612         struct kvm_s390_ext_info ext;
 613         int rc = 0;
 614
 615         spin_lock(&fi->lock);
 616         if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
 617                 spin_unlock(&fi->lock);
 618                 return 0;
 619         }
 620         ext = fi->srv_signal;
 621         memset(&fi->srv_signal, 0, sizeof(ext));
 622         clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
 623         spin_unlock(&fi->lock);
 624
 625         VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
 626                    ext.ext_params);
 627         vcpu->stat.deliver_service_signal++;
 628         trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
 629                                          ext.ext_params, 0);
 630
 631         rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
 632         rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 633         rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 634                              &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 635         rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 636                             &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 637         rc |= put_guest_lc(vcpu, ext.ext_params,
 638                            (u32 *)__LC_EXT_PARAMS);
 639
 640         return rc ? -EFAULT : 0;
 641 }
 642
 643 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
 644 {
 645         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 646         struct kvm_s390_interrupt_info *inti;
 647         int rc = 0;
 648
 649         spin_lock(&fi->lock);
 650         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
 651                                         struct kvm_s390_interrupt_info,
 652                                         list);
 653         if (inti) {
 654                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 655                                 KVM_S390_INT_PFAULT_DONE, 0,
 656                                 inti->ext.ext_params2);
 657                 list_del(&inti->list);
 658                 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
 659         }
 660         if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
 661                 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
 662         spin_unlock(&fi->lock);
 663
 664         if (inti) {
 665                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 666                                 (u16 *)__LC_EXT_INT_CODE);
 667                 rc |= put_guest_lc(vcpu, PFAULT_DONE,
 668                                 (u16 *)__LC_EXT_CPU_ADDR);
 669                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 670                                 &vcpu->arch.sie_block->gpsw,
 671                                 sizeof(psw_t));
 672                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 673                                 &vcpu->arch.sie_block->gpsw,
 674                                 sizeof(psw_t));
 675                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 676                                 (u64 *)__LC_EXT_PARAMS2);
 677                 kfree(inti);
 678         }
 679         return rc ? -EFAULT : 0;
 680 }
 681
 682 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
 683 {
 684         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 685         struct kvm_s390_interrupt_info *inti;
 686         int rc = 0;
 687
 688         spin_lock(&fi->lock);
 689         inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
 690                                         struct kvm_s390_interrupt_info,
 691                                         list);
 692         if (inti) {
 693                 VCPU_EVENT(vcpu, 4,
 694                            "interrupt: virtio parm:%x,parm64:%llx",
 695                            inti->ext.ext_params, inti->ext.ext_params2);
 696                 vcpu->stat.deliver_virtio_interrupt++;
 697                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 698                                 inti->type,
 699                                 inti->ext.ext_params,
 700                                 inti->ext.ext_params2);
 701                 list_del(&inti->list);
 702                 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
 703         }
 704         if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
 705                 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
 706         spin_unlock(&fi->lock);
 707
 708         if (inti) {
 709                 rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 710                                 (u16 *)__LC_EXT_INT_CODE);
 711                 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
 712                                 (u16 *)__LC_EXT_CPU_ADDR);
 713                 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 714                                 &vcpu->arch.sie_block->gpsw,
 715                                 sizeof(psw_t));
 716                 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 717                                 &vcpu->arch.sie_block->gpsw,
 718                                 sizeof(psw_t));
 719                 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 720                                 (u32 *)__LC_EXT_PARAMS);
 721                 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 722                                 (u64 *)__LC_EXT_PARAMS2);
 723                 kfree(inti);
 724         }
 725         return rc ? -EFAULT : 0;
 726 }
 727
 728 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 729                                      unsigned long irq_type)
 730 {
 731         struct list_head *isc_list;
 732         struct kvm_s390_float_interrupt *fi;
 733         struct kvm_s390_interrupt_info *inti = NULL;
 734         int rc = 0;
 735
 736         fi = &vcpu->kvm->arch.float_int;
 737
 738         spin_lock(&fi->lock);
 739         isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
 740         inti = list_first_entry_or_null(isc_list,
 741                                         struct kvm_s390_interrupt_info,
 742                                         list);
 743         if (inti) {
 744                 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
 745                 vcpu->stat.deliver_io_int++;
 746                 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 747                                 inti->type,
 748                                 ((__u32)inti->io.subchannel_id << 16) |
 749                                 inti->io.subchannel_nr,
 750                                 ((__u64)inti->io.io_int_parm << 32) |
 751                                 inti->io.io_int_word);
 752                 list_del(&inti->list);
 753                 fi->counters[FIRQ_CNTR_IO] -= 1;
 754         }
 755         if (list_empty(isc_list))
 756                 clear_bit(irq_type, &fi->pending_irqs);
 757         spin_unlock(&fi->lock);
 758
 759         if (inti) {
 760                 rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 761                                 (u16 *)__LC_SUBCHANNEL_ID);
 762                 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 763                                 (u16 *)__LC_SUBCHANNEL_NR);
 764                 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 765                                 (u32 *)__LC_IO_INT_PARM);
 766                 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 767                                 (u32 *)__LC_IO_INT_WORD);
 768                 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 769                                 &vcpu->arch.sie_block->gpsw,
 770                                 sizeof(psw_t));
 771                 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 772                                 &vcpu->arch.sie_block->gpsw,
 773                                 sizeof(psw_t));
 774                 kfree(inti);
 775         }
 776
 777         return rc ? -EFAULT : 0;
 778 }
 779
 780 typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
 781
 782 static const deliver_irq_t deliver_irq_funcs[] = {
 783         [IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
 784         [IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
 785         [IRQ_PEND_PROG]           = __deliver_prog,
 786         [IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
 787         [IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
 788         [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
 789         [IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
 790         [IRQ_PEND_RESTART]        = __deliver_restart,
 791         [IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
 792         [IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
 793         [IRQ_PEND_EXT_SERVICE]    = __deliver_service,
 794         [IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
 795         [IRQ_PEND_VIRTIO]         = __deliver_virtio,
 796 };
 797
 798 /* Check whether an external call is pending (deliverable or not) */
 799 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
 800 {
 801         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 802         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
 803
 804         if (!sclp_has_sigpif())
 805                 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 806
 807         return (sigp_ctrl & SIGP_CTRL_C) &&
 808                (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND);
 809 }
 810
 811 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
 812 {
 813         int rc;
 814
 815         rc = !!deliverable_irqs(vcpu);
 816
 817         if (!rc && kvm_cpu_has_pending_timer(vcpu))
 818                 rc = 1;
 819
 820         /* external call pending and deliverable */
 821         if (!rc && kvm_s390_ext_call_pending(vcpu) &&
 822             !psw_extint_disabled(vcpu) &&
 823             (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 824                 rc = 1;
 825
 826         if (!rc && !exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
 827                 rc = 1;
 828
 829         return rc;
 830 }
 831
 832 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 833 {
 834         return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
 835 }
 836
 837 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 838 {
 839         u64 now, sltime;
 840
 841         vcpu->stat.exit_wait_state++;
 842
 843         /* fast path */
 844         if (kvm_cpu_has_pending_timer(vcpu) || kvm_arch_vcpu_runnable(vcpu))
 845                 return 0;
 846
 847         if (psw_interrupts_disabled(vcpu)) {
 848                 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
 849                 return -EOPNOTSUPP; /* disabled wait */
 850         }
 851
 852         if (!ckc_interrupts_enabled(vcpu)) {
 853                 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
 854                 __set_cpu_idle(vcpu);
 855                 goto no_timer;
 856         }
 857
 858         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 859         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 860
 861         /* underflow */
 862         if (vcpu->arch.sie_block->ckc < now)
 863                 return 0;
 864
 865         __set_cpu_idle(vcpu);
 866         hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
 867         VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
 868 no_timer:
 869         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 870         kvm_vcpu_block(vcpu);
 871         __unset_cpu_idle(vcpu);
 872         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 873
 874         hrtimer_cancel(&vcpu->arch.ckc_timer);
 875         return 0;
 876 }
 877
 878 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 879 {
 880         if (waitqueue_active(&vcpu->wq)) {
 881                 /*
 882                  * The vcpu gave up the cpu voluntarily, mark it as a good
 883                  * yield-candidate.
 884                  */
 885                 vcpu->preempted = true;
 886                 wake_up_interruptible(&vcpu->wq);
 887                 vcpu->stat.halt_wakeup++;
 888         }
 889 }
 890
 891 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
 892 {
 893         struct kvm_vcpu *vcpu;
 894         u64 now, sltime;
 895
 896         vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
 897         now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
 898         sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 899
 900         /*
 901          * If the monotonic clock runs faster than the tod clock we might be
 902          * woken up too early and have to go back to sleep to avoid deadlocks.
 903          */
 904         if (vcpu->arch.sie_block->ckc > now &&
 905             hrtimer_forward_now(timer, ns_to_ktime(sltime)))
 906                 return HRTIMER_RESTART;
 907         kvm_s390_vcpu_wakeup(vcpu);
 908         return HRTIMER_NORESTART;
 909 }
 910
 911 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
 912 {
 913         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 914
 915         spin_lock(&li->lock);
 916         li->pending_irqs = 0;
 917         bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 918         memset(&li->irq, 0, sizeof(li->irq));
 919         spin_unlock(&li->lock);
 920
 921         /* clear pending external calls set by sigp interpretation facility */
 922         atomic_clear_mask(CPUSTAT_ECALL_PEND, li->cpuflags);
 923         vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl = 0;
 924 }
 925
 926 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
 927 {
 928         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 929         deliver_irq_t func;
 930         int rc = 0;
 931         unsigned long irq_type;
 932         unsigned long irqs;
 933
 934         __reset_intercept_indicators(vcpu);
 935
 936         /* pending ckc conditions might have been invalidated */
 937         clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 938         if (ckc_irq_pending(vcpu))
 939                 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 940
 941         /* pending cpu timer conditions might have been invalidated */
 942         clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 943         if (cpu_timer_irq_pending(vcpu))
 944                 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 945
 946         while ((irqs = deliverable_irqs(vcpu)) && !rc) {
 947                 /* bits are in the order of interrupt priority */
 948                 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
 949                 if (is_ioirq(irq_type)) {
 950                         rc = __deliver_io(vcpu, irq_type);
 951                 } else {
 952                         func = deliver_irq_funcs[irq_type];
 953                         if (!func) {
 954                                 WARN_ON_ONCE(func == NULL);
 955                                 clear_bit(irq_type, &li->pending_irqs);
 956                                 continue;
 957                         }
 958                         rc = func(vcpu);
 959                 }
 960         }
 961
 962         set_intercept_indicators(vcpu);
 963
 964         return rc;
 965 }
 966
 967 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
 968 {
 969         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 970
 971         li->irq.pgm = irq->u.pgm;
 972         set_bit(IRQ_PEND_PROG, &li->pending_irqs);
 973         return 0;
 974 }
 975
 976 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
 977 {
 978         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 979         struct kvm_s390_irq irq;
 980
 981         VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
 982         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT, code,
 983                                    0, 1);
 984         spin_lock(&li->lock);
 985         irq.u.pgm.code = code;
 986         __inject_prog(vcpu, &irq);
 987         BUG_ON(waitqueue_active(li->wq));
 988         spin_unlock(&li->lock);
 989         return 0;
 990 }
 991
 992 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
 993                              struct kvm_s390_pgm_info *pgm_info)
 994 {
 995         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 996         struct kvm_s390_irq irq;
 997         int rc;
 998
 999         VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
1000                    pgm_info->code);
1001         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1002                                    pgm_info->code, 0, 1);
1003         spin_lock(&li->lock);
1004         irq.u.pgm = *pgm_info;
1005         rc = __inject_prog(vcpu, &irq);
1006         BUG_ON(waitqueue_active(li->wq));
1007         spin_unlock(&li->lock);
1008         return rc;
1009 }
1010
1011 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1012 {
1013         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1014
1015         VCPU_EVENT(vcpu, 3, "inject: external irq params:%x, params2:%llx",
1016                    irq->u.ext.ext_params, irq->u.ext.ext_params2);
1017         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1018                                    irq->u.ext.ext_params,
1019                                    irq->u.ext.ext_params2, 2);
1020
1021         li->irq.ext = irq->u.ext;
1022         set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1023         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1024         return 0;
1025 }
1026
1027 static int __inject_extcall_sigpif(struct kvm_vcpu *vcpu, uint16_t src_id)
1028 {
1029         unsigned char new_val, old_val;
1030         uint8_t *sigp_ctrl = &vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
1031
1032         new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK);
1033         old_val = *sigp_ctrl & ~SIGP_CTRL_C;
1034         if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) {
1035                 /* another external call is pending */
1036                 return -EBUSY;
1037         }
1038         atomic_set_mask(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
1039         return 0;
1040 }
1041
1042 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1043 {
1044         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1045         struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1046         uint16_t src_id = irq->u.extcall.code;
1047
1048         VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1049                    src_id);
1050         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1051                                    src_id, 0, 2);
1052
1053         /* sending vcpu invalid */
1054         if (src_id >= KVM_MAX_VCPUS ||
1055             kvm_get_vcpu(vcpu->kvm, src_id) == NULL)
1056                 return -EINVAL;
1057
1058         if (sclp_has_sigpif())
1059                 return __inject_extcall_sigpif(vcpu, src_id);
1060
1061         if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1062                 return -EBUSY;
1063         *extcall = irq->u.extcall;
1064         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1065         return 0;
1066 }
1067
1068 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1069 {
1070         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1071         struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1072
1073         VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1074                    irq->u.prefix.address);
1075         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1076                                    irq->u.prefix.address, 0, 2);
1077
1078         if (!is_vcpu_stopped(vcpu))
1079                 return -EBUSY;
1080
1081         *prefix = irq->u.prefix;
1082         set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1083         return 0;
1084 }
1085
1086 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1087 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1088 {
1089         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1090         struct kvm_s390_stop_info *stop = &li->irq.stop;
1091         int rc = 0;
1092
1093         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0, 2);
1094
1095         if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1096                 return -EINVAL;
1097
1098         if (is_vcpu_stopped(vcpu)) {
1099                 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1100                         rc = kvm_s390_store_status_unloaded(vcpu,
1101                                                 KVM_S390_STORE_STATUS_NOADDR);
1102                 return rc;
1103         }
1104
1105         if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1106                 return -EBUSY;
1107         stop->flags = irq->u.stop.flags;
1108         __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1109         return 0;
1110 }
1111
1112 static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1113                                  struct kvm_s390_irq *irq)
1114 {
1115         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1116
1117         VCPU_EVENT(vcpu, 3, "inject: restart type %llx", irq->type);
1118         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0, 2);
1119
1120         set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1121         return 0;
1122 }
1123
1124 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1125                                    struct kvm_s390_irq *irq)
1126 {
1127         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1128
1129         VCPU_EVENT(vcpu, 3, "inject: emergency %u\n",
1130                    irq->u.emerg.code);
1131         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1132                                    irq->u.emerg.code, 0, 2);
1133
1134         set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1135         set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1136         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1137         return 0;
1138 }
1139
1140 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1141 {
1142         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1143         struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1144
1145         VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1146                    irq->u.mchk.mcic);
1147         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1148                                    irq->u.mchk.mcic, 2);
1149
1150         /*
1151          * Because repressible machine checks can be indicated along with
1152          * exigent machine checks (PoP, Chapter 11, Interruption action)
1153          * we need to combine cr14, mcic and external damage code.
1154          * Failing storage address and the logout area should not be or'ed
1155          * together, we just indicate the last occurrence of the corresponding
1156          * machine check
1157          */
1158         mchk->cr14 |= irq->u.mchk.cr14;
1159         mchk->mcic |= irq->u.mchk.mcic;
1160         mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1161         mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1162         memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1163                sizeof(mchk->fixed_logout));
1164         if (mchk->mcic & MCHK_EX_MASK)
1165                 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1166         else if (mchk->mcic & MCHK_REP_MASK)
1167                 set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1168         return 0;
1169 }
1170
1171 static int __inject_ckc(struct kvm_vcpu *vcpu)
1172 {
1173         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1174
1175         VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CLOCK_COMP);
1176         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1177                                    0, 0, 2);
1178
1179         set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1180         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1181         return 0;
1182 }
1183
1184 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1185 {
1186         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1187
1188         VCPU_EVENT(vcpu, 3, "inject: type %x", KVM_S390_INT_CPU_TIMER);
1189         trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1190                                    0, 0, 2);
1191
1192         set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1193         atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1194         return 0;
1195 }
1196
1197 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1198                                                   int isc, u32 schid)
1199 {
1200         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1201         struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1202         struct kvm_s390_interrupt_info *iter;
1203         u16 id = (schid & 0xffff0000U) >> 16;
1204         u16 nr = schid & 0x0000ffffU;
1205
1206         spin_lock(&fi->lock);
1207         list_for_each_entry(iter, isc_list, list) {
1208                 if (schid && (id != iter->io.subchannel_id ||
1209                               nr != iter->io.subchannel_nr))
1210                         continue;
1211                 /* found an appropriate entry */
1212                 list_del_init(&iter->list);
1213                 fi->counters[FIRQ_CNTR_IO] -= 1;
1214                 if (list_empty(isc_list))
1215                         clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1216                 spin_unlock(&fi->lock);
1217                 return iter;
1218         }
1219         spin_unlock(&fi->lock);
1220         return NULL;
1221 }
1222
1223 /*
1224  * Dequeue and return an I/O interrupt matching any of the interruption
1225  * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1226  */
1227 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1228                                                     u64 isc_mask, u32 schid)
1229 {
1230         struct kvm_s390_interrupt_info *inti = NULL;
1231         int isc;
1232
1233         for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1234                 if (isc_mask & isc_to_isc_bits(isc))
1235                         inti = get_io_int(kvm, isc, schid);
1236         }
1237         return inti;
1238 }
1239
1240 #define SCCB_MASK 0xFFFFFFF8
1241 #define SCCB_EVENT_PENDING 0x3
1242
1243 static int __inject_service(struct kvm *kvm,
1244                              struct kvm_s390_interrupt_info *inti)
1245 {
1246         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1247
1248         spin_lock(&fi->lock);
1249         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1250         /*
1251          * Early versions of the QEMU s390 bios will inject several
1252          * service interrupts after another without handling a
1253          * condition code indicating busy.
1254          * We will silently ignore those superfluous sccb values.
1255          * A future version of QEMU will take care of serialization
1256          * of servc requests
1257          */
1258         if (fi->srv_signal.ext_params & SCCB_MASK)
1259                 goto out;
1260         fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1261         set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1262 out:
1263         spin_unlock(&fi->lock);
1264         kfree(inti);
1265         return 0;
1266 }
1267
1268 static int __inject_virtio(struct kvm *kvm,
1269                             struct kvm_s390_interrupt_info *inti)
1270 {
1271         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1272
1273         spin_lock(&fi->lock);
1274         if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1275                 spin_unlock(&fi->lock);
1276                 return -EBUSY;
1277         }
1278         fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1279         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1280         set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1281         spin_unlock(&fi->lock);
1282         return 0;
1283 }
1284
1285 static int __inject_pfault_done(struct kvm *kvm,
1286                                  struct kvm_s390_interrupt_info *inti)
1287 {
1288         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1289
1290         spin_lock(&fi->lock);
1291         if (fi->counters[FIRQ_CNTR_PFAULT] >=
1292                 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1293                 spin_unlock(&fi->lock);
1294                 return -EBUSY;
1295         }
1296         fi->counters[FIRQ_CNTR_PFAULT] += 1;
1297         list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1298         set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1299         spin_unlock(&fi->lock);
1300         return 0;
1301 }
1302
1303 #define CR_PENDING_SUBCLASS 28
1304 static int __inject_float_mchk(struct kvm *kvm,
1305                                 struct kvm_s390_interrupt_info *inti)
1306 {
1307         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1308
1309         spin_lock(&fi->lock);
1310         fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1311         fi->mchk.mcic |= inti->mchk.mcic;
1312         set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1313         spin_unlock(&fi->lock);
1314         kfree(inti);
1315         return 0;
1316 }
1317
1318 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1319 {
1320         struct kvm_s390_float_interrupt *fi;
1321         struct list_head *list;
1322         int isc;
1323
1324         fi = &kvm->arch.float_int;
1325         spin_lock(&fi->lock);
1326         if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1327                 spin_unlock(&fi->lock);
1328                 return -EBUSY;
1329         }
1330         fi->counters[FIRQ_CNTR_IO] += 1;
1331
1332         isc = int_word_to_isc(inti->io.io_int_word);
1333         list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1334         list_add_tail(&inti->list, list);
1335         set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1336         spin_unlock(&fi->lock);
1337         return 0;
1338 }
1339
1340 /*
1341  * Find a destination VCPU for a floating irq and kick it.
1342  */
1343 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1344 {
1345         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1346         struct kvm_s390_local_interrupt *li;
1347         struct kvm_vcpu *dst_vcpu;
1348         int sigcpu, online_vcpus, nr_tries = 0;
1349
1350         online_vcpus = atomic_read(&kvm->online_vcpus);
1351         if (!online_vcpus)
1352                 return;
1353
1354         /* find idle VCPUs first, then round robin */
1355         sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1356         if (sigcpu == online_vcpus) {
1357                 do {
1358                         sigcpu = fi->next_rr_cpu;
1359                         fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1360                         /* avoid endless loops if all vcpus are stopped */
1361                         if (nr_tries++ >= online_vcpus)
1362                                 return;
1363                 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1364         }
1365         dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1366
1367         /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1368         li = &dst_vcpu->arch.local_int;
1369         spin_lock(&li->lock);
1370         switch (type) {
1371         case KVM_S390_MCHK:
1372                 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
1373                 break;
1374         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1375                 atomic_set_mask(CPUSTAT_IO_INT, li->cpuflags);
1376                 break;
1377         default:
1378                 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1379                 break;
1380         }
1381         spin_unlock(&li->lock);
1382         kvm_s390_vcpu_wakeup(dst_vcpu);
1383 }
1384
1385 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1386 {
1387         struct kvm_s390_float_interrupt *fi;
1388         u64 type = READ_ONCE(inti->type);
1389         int rc;
1390
1391         fi = &kvm->arch.float_int;
1392
1393         switch (type) {
1394         case KVM_S390_MCHK:
1395                 rc = __inject_float_mchk(kvm, inti);
1396                 break;
1397         case KVM_S390_INT_VIRTIO:
1398                 rc = __inject_virtio(kvm, inti);
1399                 break;
1400         case KVM_S390_INT_SERVICE:
1401                 rc = __inject_service(kvm, inti);
1402                 break;
1403         case KVM_S390_INT_PFAULT_DONE:
1404                 rc = __inject_pfault_done(kvm, inti);
1405                 break;
1406         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1407                 rc = __inject_io(kvm, inti);
1408                 break;
1409         default:
1410                 rc = -EINVAL;
1411         }
1412         if (rc)
1413                 return rc;
1414
1415         __floating_irq_kick(kvm, type);
1416         return 0;
1417 }
1418
1419 int kvm_s390_inject_vm(struct kvm *kvm,
1420                        struct kvm_s390_interrupt *s390int)
1421 {
1422         struct kvm_s390_interrupt_info *inti;
1423         int rc;
1424
1425         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1426         if (!inti)
1427                 return -ENOMEM;
1428
1429         inti->type = s390int->type;
1430         switch (inti->type) {
1431         case KVM_S390_INT_VIRTIO:
1432                 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1433                          s390int->parm, s390int->parm64);
1434                 inti->ext.ext_params = s390int->parm;
1435                 inti->ext.ext_params2 = s390int->parm64;
1436                 break;
1437         case KVM_S390_INT_SERVICE:
1438                 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
1439                 inti->ext.ext_params = s390int->parm;
1440                 break;
1441         case KVM_S390_INT_PFAULT_DONE:
1442                 inti->ext.ext_params2 = s390int->parm64;
1443                 break;
1444         case KVM_S390_MCHK:
1445                 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
1446                          s390int->parm64);
1447                 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1448                 inti->mchk.mcic = s390int->parm64;
1449                 break;
1450         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1451                 if (inti->type & IOINT_AI_MASK)
1452                         VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
1453                 else
1454                         VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
1455                                  s390int->type & IOINT_CSSID_MASK,
1456                                  s390int->type & IOINT_SSID_MASK,
1457                                  s390int->type & IOINT_SCHID_MASK);
1458                 inti->io.subchannel_id = s390int->parm >> 16;
1459                 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1460                 inti->io.io_int_parm = s390int->parm64 >> 32;
1461                 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1462                 break;
1463         default:
1464                 kfree(inti);
1465                 return -EINVAL;
1466         }
1467         trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1468                                  2);
1469
1470         rc = __inject_vm(kvm, inti);
1471         if (rc)
1472                 kfree(inti);
1473         return rc;
1474 }
1475
1476 int kvm_s390_reinject_io_int(struct kvm *kvm,
1477                               struct kvm_s390_interrupt_info *inti)
1478 {
1479         return __inject_vm(kvm, inti);
1480 }
1481
1482 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1483                        struct kvm_s390_irq *irq)
1484 {
1485         irq->type = s390int->type;
1486         switch (irq->type) {
1487         case KVM_S390_PROGRAM_INT:
1488                 if (s390int->parm & 0xffff0000)
1489                         return -EINVAL;
1490                 irq->u.pgm.code = s390int->parm;
1491                 break;
1492         case KVM_S390_SIGP_SET_PREFIX:
1493                 irq->u.prefix.address = s390int->parm;
1494                 break;
1495         case KVM_S390_SIGP_STOP:
1496                 irq->u.stop.flags = s390int->parm;
1497                 break;
1498         case KVM_S390_INT_EXTERNAL_CALL:
1499                 if (s390int->parm & 0xffff0000)
1500                         return -EINVAL;
1501                 irq->u.extcall.code = s390int->parm;
1502                 break;
1503         case KVM_S390_INT_EMERGENCY:
1504                 if (s390int->parm & 0xffff0000)
1505                         return -EINVAL;
1506                 irq->u.emerg.code = s390int->parm;
1507                 break;
1508         case KVM_S390_MCHK:
1509                 irq->u.mchk.mcic = s390int->parm64;
1510                 break;
1511         }
1512         return 0;
1513 }
1514
1515 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1516 {
1517         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1518
1519         return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1520 }
1521
1522 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1523 {
1524         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1525
1526         spin_lock(&li->lock);
1527         li->irq.stop.flags = 0;
1528         clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1529         spin_unlock(&li->lock);
1530 }
1531
1532 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1533 {
1534         int rc;
1535
1536         switch (irq->type) {
1537         case KVM_S390_PROGRAM_INT:
1538                 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1539                            irq->u.pgm.code);
1540                 rc = __inject_prog(vcpu, irq);
1541                 break;
1542         case KVM_S390_SIGP_SET_PREFIX:
1543                 rc = __inject_set_prefix(vcpu, irq);
1544                 break;
1545         case KVM_S390_SIGP_STOP:
1546                 rc = __inject_sigp_stop(vcpu, irq);
1547                 break;
1548         case KVM_S390_RESTART:
1549                 rc = __inject_sigp_restart(vcpu, irq);
1550                 break;
1551         case KVM_S390_INT_CLOCK_COMP:
1552                 rc = __inject_ckc(vcpu);
1553                 break;
1554         case KVM_S390_INT_CPU_TIMER:
1555                 rc = __inject_cpu_timer(vcpu);
1556                 break;
1557         case KVM_S390_INT_EXTERNAL_CALL:
1558                 rc = __inject_extcall(vcpu, irq);
1559                 break;
1560         case KVM_S390_INT_EMERGENCY:
1561                 rc = __inject_sigp_emergency(vcpu, irq);
1562                 break;
1563         case KVM_S390_MCHK:
1564                 rc = __inject_mchk(vcpu, irq);
1565                 break;
1566         case KVM_S390_INT_PFAULT_INIT:
1567                 rc = __inject_pfault_init(vcpu, irq);
1568                 break;
1569         case KVM_S390_INT_VIRTIO:
1570         case KVM_S390_INT_SERVICE:
1571         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1572         default:
1573                 rc = -EINVAL;
1574         }
1575
1576         return rc;
1577 }
1578
1579 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1580 {
1581         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1582         int rc;
1583
1584         spin_lock(&li->lock);
1585         rc = do_inject_vcpu(vcpu, irq);
1586         spin_unlock(&li->lock);
1587         if (!rc)
1588                 kvm_s390_vcpu_wakeup(vcpu);
1589         return rc;
1590 }
1591
1592 static inline void clear_irq_list(struct list_head *_list)
1593 {
1594         struct kvm_s390_interrupt_info *inti, *n;
1595
1596         list_for_each_entry_safe(inti, n, _list, list) {
1597                 list_del(&inti->list);
1598                 kfree(inti);
1599         }
1600 }
1601
1602 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1603                        struct kvm_s390_irq *irq)
1604 {
1605         irq->type = inti->type;
1606         switch (inti->type) {
1607         case KVM_S390_INT_PFAULT_INIT:
1608         case KVM_S390_INT_PFAULT_DONE:
1609         case KVM_S390_INT_VIRTIO:
1610                 irq->u.ext = inti->ext;
1611                 break;
1612         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1613                 irq->u.io = inti->io;
1614                 break;
1615         }
1616 }
1617
1618 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1619 {
1620         struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1621         int i;
1622
1623         spin_lock(&fi->lock);
1624         for (i = 0; i < FIRQ_LIST_COUNT; i++)
1625                 clear_irq_list(&fi->lists[i]);
1626         for (i = 0; i < FIRQ_MAX_COUNT; i++)
1627                 fi->counters[i] = 0;
1628         spin_unlock(&fi->lock);
1629 };
1630
1631 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1632 {
1633         struct kvm_s390_interrupt_info *inti;
1634         struct kvm_s390_float_interrupt *fi;
1635         struct kvm_s390_irq *buf;
1636         struct kvm_s390_irq *irq;
1637         int max_irqs;
1638         int ret = 0;
1639         int n = 0;
1640         int i;
1641
1642         if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1643                 return -EINVAL;
1644
1645         /*
1646          * We are already using -ENOMEM to signal
1647          * userspace it may retry with a bigger buffer,
1648          * so we need to use something else for this case
1649          */
1650         buf = vzalloc(len);
1651         if (!buf)
1652                 return -ENOBUFS;
1653
1654         max_irqs = len / sizeof(struct kvm_s390_irq);
1655
1656         fi = &kvm->arch.float_int;
1657         spin_lock(&fi->lock);
1658         for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1659                 list_for_each_entry(inti, &fi->lists[i], list) {
1660                         if (n == max_irqs) {
1661                                 /* signal userspace to try again */
1662                                 ret = -ENOMEM;
1663                                 goto out;
1664                         }
1665                         inti_to_irq(inti, &buf[n]);
1666                         n++;
1667                 }
1668         }
1669         if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1670                 if (n == max_irqs) {
1671                         /* signal userspace to try again */
1672                         ret = -ENOMEM;
1673                         goto out;
1674                 }
1675                 irq = (struct kvm_s390_irq *) &buf[n];
1676                 irq->type = KVM_S390_INT_SERVICE;
1677                 irq->u.ext = fi->srv_signal;
1678                 n++;
1679         }
1680         if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1681                 if (n == max_irqs) {
1682                                 /* signal userspace to try again */
1683                                 ret = -ENOMEM;
1684                                 goto out;
1685                 }
1686                 irq = (struct kvm_s390_irq *) &buf[n];
1687                 irq->type = KVM_S390_MCHK;
1688                 irq->u.mchk = fi->mchk;
1689                 n++;
1690 }
1691
1692 out:
1693         spin_unlock(&fi->lock);
1694         if (!ret && n > 0) {
1695                 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1696                         ret = -EFAULT;
1697         }
1698         vfree(buf);
1699
1700         return ret < 0 ? ret : n;
1701 }
1702
1703 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1704 {
1705         int r;
1706
1707         switch (attr->group) {
1708         case KVM_DEV_FLIC_GET_ALL_IRQS:
1709                 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1710                                           attr->attr);
1711                 break;
1712         default:
1713                 r = -EINVAL;
1714         }
1715
1716         return r;
1717 }
1718
1719 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1720                                      u64 addr)
1721 {
1722         struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1723         void *target = NULL;
1724         void __user *source;
1725         u64 size;
1726
1727         if (get_user(inti->type, (u64 __user *)addr))
1728                 return -EFAULT;
1729
1730         switch (inti->type) {
1731         case KVM_S390_INT_PFAULT_INIT:
1732         case KVM_S390_INT_PFAULT_DONE:
1733         case KVM_S390_INT_VIRTIO:
1734         case KVM_S390_INT_SERVICE:
1735                 target = (void *) &inti->ext;
1736                 source = &uptr->u.ext;
1737                 size = sizeof(inti->ext);
1738                 break;
1739         case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1740                 target = (void *) &inti->io;
1741                 source = &uptr->u.io;
1742                 size = sizeof(inti->io);
1743                 break;
1744         case KVM_S390_MCHK:
1745                 target = (void *) &inti->mchk;
1746                 source = &uptr->u.mchk;
1747                 size = sizeof(inti->mchk);
1748                 break;
1749         default:
1750                 return -EINVAL;
1751         }
1752
1753         if (copy_from_user(target, source, size))
1754                 return -EFAULT;
1755
1756         return 0;
1757 }
1758
1759 static int enqueue_floating_irq(struct kvm_device *dev,
1760                                 struct kvm_device_attr *attr)
1761 {
1762         struct kvm_s390_interrupt_info *inti = NULL;
1763         int r = 0;
1764         int len = attr->attr;
1765
1766         if (len % sizeof(struct kvm_s390_irq) != 0)
1767                 return -EINVAL;
1768         else if (len > KVM_S390_FLIC_MAX_BUFFER)
1769                 return -EINVAL;
1770
1771         while (len >= sizeof(struct kvm_s390_irq)) {
1772                 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1773                 if (!inti)
1774                         return -ENOMEM;
1775
1776                 r = copy_irq_from_user(inti, attr->addr);
1777                 if (r) {
1778                         kfree(inti);
1779                         return r;
1780                 }
1781                 r = __inject_vm(dev->kvm, inti);
1782                 if (r) {
1783                         kfree(inti);
1784                         return r;
1785                 }
1786                 len -= sizeof(struct kvm_s390_irq);
1787                 attr->addr += sizeof(struct kvm_s390_irq);
1788         }
1789
1790         return r;
1791 }
1792
1793 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1794 {
1795         if (id >= MAX_S390_IO_ADAPTERS)
1796                 return NULL;
1797         return kvm->arch.adapters[id];
1798 }
1799
1800 static int register_io_adapter(struct kvm_device *dev,
1801                                struct kvm_device_attr *attr)
1802 {
1803         struct s390_io_adapter *adapter;
1804         struct kvm_s390_io_adapter adapter_info;
1805
1806         if (copy_from_user(&adapter_info,
1807                            (void __user *)attr->addr, sizeof(adapter_info)))
1808                 return -EFAULT;
1809
1810         if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1811             (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1812                 return -EINVAL;
1813
1814         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1815         if (!adapter)
1816                 return -ENOMEM;
1817
1818         INIT_LIST_HEAD(&adapter->maps);
1819         init_rwsem(&adapter->maps_lock);
1820         atomic_set(&adapter->nr_maps, 0);
1821         adapter->id = adapter_info.id;
1822         adapter->isc = adapter_info.isc;
1823         adapter->maskable = adapter_info.maskable;
1824         adapter->masked = false;
1825         adapter->swap = adapter_info.swap;
1826         dev->kvm->arch.adapters[adapter->id] = adapter;
1827
1828         return 0;
1829 }
1830
1831 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1832 {
1833         int ret;
1834         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1835
1836         if (!adapter || !adapter->maskable)
1837                 return -EINVAL;
1838         ret = adapter->masked;
1839         adapter->masked = masked;
1840         return ret;
1841 }
1842
1843 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1844 {
1845         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1846         struct s390_map_info *map;
1847         int ret;
1848
1849         if (!adapter || !addr)
1850                 return -EINVAL;
1851
1852         map = kzalloc(sizeof(*map), GFP_KERNEL);
1853         if (!map) {
1854                 ret = -ENOMEM;
1855                 goto out;
1856         }
1857         INIT_LIST_HEAD(&map->list);
1858         map->guest_addr = addr;
1859         map->addr = gmap_translate(kvm->arch.gmap, addr);
1860         if (map->addr == -EFAULT) {
1861                 ret = -EFAULT;
1862                 goto out;
1863         }
1864         ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1865         if (ret < 0)
1866                 goto out;
1867         BUG_ON(ret != 1);
1868         down_write(&adapter->maps_lock);
1869         if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1870                 list_add_tail(&map->list, &adapter->maps);
1871                 ret = 0;
1872         } else {
1873                 put_page(map->page);
1874                 ret = -EINVAL;
1875         }
1876         up_write(&adapter->maps_lock);
1877 out:
1878         if (ret)
1879                 kfree(map);
1880         return ret;
1881 }
1882
1883 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1884 {
1885         struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1886         struct s390_map_info *map, *tmp;
1887         int found = 0;
1888
1889         if (!adapter || !addr)
1890                 return -EINVAL;
1891
1892         down_write(&adapter->maps_lock);
1893         list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1894                 if (map->guest_addr == addr) {
1895                         found = 1;
1896                         atomic_dec(&adapter->nr_maps);
1897                         list_del(&map->list);
1898                         put_page(map->page);
1899                         kfree(map);
1900                         break;
1901                 }
1902         }
1903         up_write(&adapter->maps_lock);
1904
1905         return found ? 0 : -EINVAL;
1906 }
1907
1908 void kvm_s390_destroy_adapters(struct kvm *kvm)
1909 {
1910         int i;
1911         struct s390_map_info *map, *tmp;
1912
1913         for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1914                 if (!kvm->arch.adapters[i])
1915                         continue;
1916                 list_for_each_entry_safe(map, tmp,
1917                                          &kvm->arch.adapters[i]->maps, list) {
1918                         list_del(&map->list);
1919                         put_page(map->page);
1920                         kfree(map);
1921                 }
1922                 kfree(kvm->arch.adapters[i]);
1923         }
1924 }
1925
1926 static int modify_io_adapter(struct kvm_device *dev,
1927                              struct kvm_device_attr *attr)
1928 {
1929         struct kvm_s390_io_adapter_req req;
1930         struct s390_io_adapter *adapter;
1931         int ret;
1932
1933         if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1934                 return -EFAULT;
1935
1936         adapter = get_io_adapter(dev->kvm, req.id);
1937         if (!adapter)
1938                 return -EINVAL;
1939         switch (req.type) {
1940         case KVM_S390_IO_ADAPTER_MASK:
1941                 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1942                 if (ret > 0)
1943                         ret = 0;
1944                 break;
1945         case KVM_S390_IO_ADAPTER_MAP:
1946                 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1947                 break;
1948         case KVM_S390_IO_ADAPTER_UNMAP:
1949                 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1950                 break;
1951         default:
1952                 ret = -EINVAL;
1953         }
1954
1955         return ret;
1956 }
1957
1958 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1959 {
1960         int r = 0;
1961         unsigned int i;
1962         struct kvm_vcpu *vcpu;
1963
1964         switch (attr->group) {
1965         case KVM_DEV_FLIC_ENQUEUE:
1966                 r = enqueue_floating_irq(dev, attr);
1967                 break;
1968         case KVM_DEV_FLIC_CLEAR_IRQS:
1969                 kvm_s390_clear_float_irqs(dev->kvm);
1970                 break;
1971         case KVM_DEV_FLIC_APF_ENABLE:
1972                 dev->kvm->arch.gmap->pfault_enabled = 1;
1973                 break;
1974         case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1975                 dev->kvm->arch.gmap->pfault_enabled = 0;
1976                 /*
1977                  * Make sure no async faults are in transition when
1978                  * clearing the queues. So we don't need to worry
1979                  * about late coming workers.
1980                  */
1981                 synchronize_srcu(&dev->kvm->srcu);
1982                 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1983                         kvm_clear_async_pf_completion_queue(vcpu);
1984                 break;
1985         case KVM_DEV_FLIC_ADAPTER_REGISTER:
1986                 r = register_io_adapter(dev, attr);
1987                 break;
1988         case KVM_DEV_FLIC_ADAPTER_MODIFY:
1989                 r = modify_io_adapter(dev, attr);
1990                 break;
1991         default:
1992                 r = -EINVAL;
1993         }
1994
1995         return r;
1996 }
1997
1998 static int flic_create(struct kvm_device *dev, u32 type)
1999 {
2000         if (!dev)
2001                 return -EINVAL;
2002         if (dev->kvm->arch.flic)
2003                 return -EINVAL;
2004         dev->kvm->arch.flic = dev;
2005         return 0;
2006 }
2007
2008 static void flic_destroy(struct kvm_device *dev)
2009 {
2010         dev->kvm->arch.flic = NULL;
2011         kfree(dev);
2012 }
2013
2014 /* s390 floating irq controller (flic) */
2015 struct kvm_device_ops kvm_flic_ops = {
2016         .name = "kvm-flic",
2017         .get_attr = flic_get_attr,
2018         .set_attr = flic_set_attr,
2019         .create = flic_create,
2020         .destroy = flic_destroy,
2021 };
2022
2023 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2024 {
2025         unsigned long bit;
2026
2027         bit = bit_nr + (addr % PAGE_SIZE) * 8;
2028
2029         return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2030 }
2031
2032 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2033                                           u64 addr)
2034 {
2035         struct s390_map_info *map;
2036
2037         if (!adapter)
2038                 return NULL;
2039
2040         list_for_each_entry(map, &adapter->maps, list) {
2041                 if (map->guest_addr == addr)
2042                         return map;
2043         }
2044         return NULL;
2045 }
2046
2047 static int adapter_indicators_set(struct kvm *kvm,
2048                                   struct s390_io_adapter *adapter,
2049                                   struct kvm_s390_adapter_int *adapter_int)
2050 {
2051         unsigned long bit;
2052         int summary_set, idx;
2053         struct s390_map_info *info;
2054         void *map;
2055
2056         info = get_map_info(adapter, adapter_int->ind_addr);
2057         if (!info)
2058                 return -1;
2059         map = page_address(info->page);
2060         bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2061         set_bit(bit, map);
2062         idx = srcu_read_lock(&kvm->srcu);
2063         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2064         set_page_dirty_lock(info->page);
2065         info = get_map_info(adapter, adapter_int->summary_addr);
2066         if (!info) {
2067                 srcu_read_unlock(&kvm->srcu, idx);
2068                 return -1;
2069         }
2070         map = page_address(info->page);
2071         bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2072                           adapter->swap);
2073         summary_set = test_and_set_bit(bit, map);
2074         mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2075         set_page_dirty_lock(info->page);
2076         srcu_read_unlock(&kvm->srcu, idx);
2077         return summary_set ? 0 : 1;
2078 }
2079
2080 /*
2081  * < 0 - not injected due to error
2082  * = 0 - coalesced, summary indicator already active
2083  * > 0 - injected interrupt
2084  */
2085 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2086                            struct kvm *kvm, int irq_source_id, int level,
2087                            bool line_status)
2088 {
2089         int ret;
2090         struct s390_io_adapter *adapter;
2091
2092         /* We're only interested in the 0->1 transition. */
2093         if (!level)
2094                 return 0;
2095         adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2096         if (!adapter)
2097                 return -1;
2098         down_read(&adapter->maps_lock);
2099         ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2100         up_read(&adapter->maps_lock);
2101         if ((ret > 0) && !adapter->masked) {
2102                 struct kvm_s390_interrupt s390int = {
2103                         .type = KVM_S390_INT_IO(1, 0, 0, 0),
2104                         .parm = 0,
2105                         .parm64 = (adapter->isc << 27) | 0x80000000,
2106                 };
2107                 ret = kvm_s390_inject_vm(kvm, &s390int);
2108                 if (ret == 0)
2109                         ret = 1;
2110         }
2111         return ret;
2112 }
2113
2114 int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
2115                           const struct kvm_irq_routing_entry *ue)
2116 {
2117         int ret;
2118
2119         switch (ue->type) {
2120         case KVM_IRQ_ROUTING_S390_ADAPTER:
2121                 e->set = set_adapter_int;
2122                 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2123                 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2124                 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2125                 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2126                 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2127                 ret = 0;
2128                 break;
2129         default:
2130                 ret = -EINVAL;
2131         }
2132
2133         return ret;
2134 }
2135
2136 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2137                 int irq_source_id, int level, bool line_status)
2138 {
2139         return -EINVAL;
2140 }
2141
2142 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2143 {
2144         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2145         struct kvm_s390_irq *buf;
2146         int r = 0;
2147         int n;
2148
2149         buf = vmalloc(len);
2150         if (!buf)
2151                 return -ENOMEM;
2152
2153         if (copy_from_user((void *) buf, irqstate, len)) {
2154                 r = -EFAULT;
2155                 goto out_free;
2156         }
2157
2158         /*
2159          * Don't allow setting the interrupt state
2160          * when there are already interrupts pending
2161          */
2162         spin_lock(&li->lock);
2163         if (li->pending_irqs) {
2164                 r = -EBUSY;
2165                 goto out_unlock;
2166         }
2167
2168         for (n = 0; n < len / sizeof(*buf); n++) {
2169                 r = do_inject_vcpu(vcpu, &buf[n]);
2170                 if (r)
2171                         break;
2172         }
2173
2174 out_unlock:
2175         spin_unlock(&li->lock);
2176 out_free:
2177         vfree(buf);
2178
2179         return r;
2180 }
2181
2182 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2183                             struct kvm_s390_irq *irq,
2184                             unsigned long irq_type)
2185 {
2186         switch (irq_type) {
2187         case IRQ_PEND_MCHK_EX:
2188         case IRQ_PEND_MCHK_REP:
2189                 irq->type = KVM_S390_MCHK;
2190                 irq->u.mchk = li->irq.mchk;
2191                 break;
2192         case IRQ_PEND_PROG:
2193                 irq->type = KVM_S390_PROGRAM_INT;
2194                 irq->u.pgm = li->irq.pgm;
2195                 break;
2196         case IRQ_PEND_PFAULT_INIT:
2197                 irq->type = KVM_S390_INT_PFAULT_INIT;
2198                 irq->u.ext = li->irq.ext;
2199                 break;
2200         case IRQ_PEND_EXT_EXTERNAL:
2201                 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2202                 irq->u.extcall = li->irq.extcall;
2203                 break;
2204         case IRQ_PEND_EXT_CLOCK_COMP:
2205                 irq->type = KVM_S390_INT_CLOCK_COMP;
2206                 break;
2207         case IRQ_PEND_EXT_CPU_TIMER:
2208                 irq->type = KVM_S390_INT_CPU_TIMER;
2209                 break;
2210         case IRQ_PEND_SIGP_STOP:
2211                 irq->type = KVM_S390_SIGP_STOP;
2212                 irq->u.stop = li->irq.stop;
2213                 break;
2214         case IRQ_PEND_RESTART:
2215                 irq->type = KVM_S390_RESTART;
2216                 break;
2217         case IRQ_PEND_SET_PREFIX:
2218                 irq->type = KVM_S390_SIGP_SET_PREFIX;
2219                 irq->u.prefix = li->irq.prefix;
2220                 break;
2221         }
2222 }
2223
2224 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2225 {
2226         uint8_t sigp_ctrl = vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sigp_ctrl;
2227         unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2228         struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2229         unsigned long pending_irqs;
2230         struct kvm_s390_irq irq;
2231         unsigned long irq_type;
2232         int cpuaddr;
2233         int n = 0;
2234
2235         spin_lock(&li->lock);
2236         pending_irqs = li->pending_irqs;
2237         memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2238                sizeof(sigp_emerg_pending));
2239         spin_unlock(&li->lock);
2240
2241         for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2242                 memset(&irq, 0, sizeof(irq));
2243                 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2244                         continue;
2245                 if (n + sizeof(irq) > len)
2246                         return -ENOBUFS;
2247                 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2248                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2249                         return -EFAULT;
2250                 n += sizeof(irq);
2251         }
2252
2253         if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2254                 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2255                         memset(&irq, 0, sizeof(irq));
2256                         if (n + sizeof(irq) > len)
2257                                 return -ENOBUFS;
2258                         irq.type = KVM_S390_INT_EMERGENCY;
2259                         irq.u.emerg.code = cpuaddr;
2260                         if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2261                                 return -EFAULT;
2262                         n += sizeof(irq);
2263                 }
2264         }
2265
2266         if ((sigp_ctrl & SIGP_CTRL_C) &&
2267             (atomic_read(&vcpu->arch.sie_block->cpuflags) &
2268              CPUSTAT_ECALL_PEND)) {
2269                 if (n + sizeof(irq) > len)
2270                         return -ENOBUFS;
2271                 memset(&irq, 0, sizeof(irq));
2272                 irq.type = KVM_S390_INT_EXTERNAL_CALL;
2273                 irq.u.extcall.code = sigp_ctrl & SIGP_CTRL_SCN_MASK;
2274                 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2275                         return -EFAULT;
2276                 n += sizeof(irq);
2277         }
2278
2279         return n;
2280 }